Seven years passed since the Cell Game. Much has changed during this era of peace. Gohan is a student of Orange Star High School, and became the boyfriend of Videl, Sataan's daughter. Trunks is now eight years old. His best friend is Goten, Gohan's little brother who is one year younger than Trunks. Klilyn married Android #18 and became the father of Marron. Vegeta settled down after Gokou's death. The peace will now last long...

Gokou is competing in a fighting tournament of the dead. His meets a stalement with his new friend and opponent, Paiku-han. On Earth, Gohan is training Goten and Vegeta is training Trunks. Gohan and Vegeta become shocked at the fact that Goten and Trunks can reach Super Saiyan stage at such young ages.

There is another Tenkaichi Boudoukai on Earth. Goten and Trunks want to attend in the competition, but are banned because they are too young. However, they steal a competitor's costume and wear it. They battle Android 18 and their disguise is revealed. Piccolo faces someone known as Kaiou-shin, but freezes upon sensing his opponent's power. Gokou is granted a single day of life to fight at the tournament so he is also present. It is Gohan's turn to compete. He has assumed the identity as a masked crime fighter known as the Great Saiyan-Man. Gohan powers up and turns Super Saiyan mode. This blows off his disguise and the audience learns that the Great Saiyan-Man is really the nerd Gohan. Spopobitch and Yamu, two competitors with a "M" on their foreheads, fly out to the battle ring and approach Gohan. Then, the two mysterious men take out a lamp and use it to absorb Gohan's energy. Gohan falls unconsicous, Spopobitch and Yamu fly away, and everyone else become shocked and wonder what just happened.

Kaiou-shin and his partner approach the Z warriors and revive Gohan. Then, they tell their story. They are really godly beings beyond Kaiou and are here to stop the plot of Babi-di and Darbura. Babi-di is an ugly little being who wants to destroy all life just for the fun of it. Darbura is the Prince of Darkness. Babi-di and Darbura are allied at the task of reviving someone called Boo. To do so, a lot of energy is needed. Everyone learns that Spopobitch and Yamu are zombies of Babi-di. That is why they absorbed Gohan's energy. Allowing Sopopobitch and Yamu to attack Gohan was part of the plan to follow them to Babi-di's lair. A new terror breaches over the Earth. The Z warriors decide to help Kaiou-shin for the sake of their planet, and follow Spopobitch and Yamu to Babi-di and Darbura's lair.

Babi-di and Darbura's minions are killed in the battles to come. Our heroes face Darbura now. Unaware of Darbura's ability to "stone", Klilyn and Piccolo are turned into stone. The only remedy to the curse would be Darbura's death. Darbura is eventually killed and Klilyn and Piccolo are restored to normal.

Learning that becoming Babi-di's slave will make him stronger, Vegeta volunteers to become Babi-di's slave. A "M" appears on Vegeta's forehead and he turns evil once again. Majin-Vegeta looks forward for another battle against Gokou and hopes to defeat him once and for all.

Vegeta's power donation to Babi-di grants enough energy to revive the fat being known as Boo. Boo is re-awakened and Babi-di rides around the city on top of him. Cities begin to get terrorized.

Majin-Vegeta knocks out Gokou, but realizes that good triumphs over evil. He regains his sanity and truely becomes good. Majin-Vegeta goes off for Boo and fights him. Boo is a lot stronger and has the advantage. In a final effort to defeat Boo, Vegeta self-destructs, hoping that his sacrifice will take Boo down with him. To his dismay, Boo survives.

Even in Super Saiyan level 2, Gokou is unable to defeat Boo. Rage increases, and Gokou reaches Super Saiyan level 3 for the first time! Meanwhile, Bulma gathers the dragonballs to revive all the civilians killed by the Majins since the Tenkaichi Boudoukai.

Boo grows tired of being Babi-di's slave and kills him. Then, he purifies himself by fission and splits into two beings. One is pure good, and the other is pure evil. The two Boos fight and the evil one turns the good Boo into a cookie. The cookie is eaten, and Boo powers up in a body transformation. The fat Boo is now leaner and more muscular.

Meanwhile, Gohan heads to Kaiou-shin's planet to receive training. As a sign of respect, he wears the Kaiou-shin suit. Gohan pulls out the legendary Z Sword and begins to train under Dai Kaiou-shin, the Elder Kaiou-shin. Gohan is learning how to use his hidden powers without getting angry to go Super Saiyan mode

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